What is the LUNnumber?

Click the Exhibit button. The exhibit shows paths of a SAN LUN. What is the LUN
number?
Exhibit:

A.
1

B.
0

C.
2

D.
3

Explanation:
Fibre Channel SAN Configuration Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0, page 53
Understanding Storage Device Naming

Runtime Name

The name of the path to the device. The runtime name is created by the host. The name is
not a reliable identifier for the device, and is not persistent. The runtime name has the
following format:
vmhba#:C#:T#:L#, where
vmhba# is the name of the storage adapter. The name refers to the physical adapter on the
host, not to the SCSI controller used by the virtual machines.
C# is the storage channel number.
T# is the target number. Target numbering is decided by the host and might change if
there is a change in the mappings of targets visible to the host. Targets that are shared by
different hosts might not have the same target number.
L# is the LUN number that shows the position of the LUN within the target. The LUN
number is provided by the storage system. If a target has only one LUN, the LUN
number is always zero (0).

For example, vmhba1:C0:T3:L1 represents LUN1 on target 3 accessed through the
storage adapter vmhba1 and channel 0.

Therefore vmhba2:2:0, vmhba2:3:0, vmhba3:0:0 and vmhba3:1:0 all have a LUN number
of 0.